ath patch+hal for test

[Sam Leffler]

You can find the 0.9.16.13 hal (that's been out for a while) and an
updated ath.patch at http://www.freebsd.org/~sam/ath.  Please test and
report any regressions against what is in CVS.  This patch should work
on both HEAD and RELENG_6.  I hope to get things in CVS in time to make
the 6.1 release so timely feedback is important.

This hal is required if you have one of the newer Atheros parts (e.g.
5414).  I've mainly tested station mode so beware of ap mode problems.

I am aware of one issue that is not fixed in this patch: beacon miss
handling may not work correctly if the beacon timers are initialized
with a stale tsf (as can happen when scanning many channels).  This
affects both station and adhoc mode operation and will be fixed when I
commit the changes.

If you have a laptop with a radio on/off switch I've tried to add the
necessary glue to make it functional but since I don't have any laptops
of this sort the code is untested.

	Sam